[clang] [CIR] Implement functional cast to ComplexType (PR #147147)

[Amr Hesham via cfe-commits]

https://github.com/AmrDeveloper updated 
https://github.com/llvm/llvm-project/pull/147147

>From bb6602546c35f6a25a4a64141ec9d1edff65dd95 Mon Sep 17 00:00:00 2001
From: AmrDeveloper <am...@programmer.net>
Date: Sat, 5 Jul 2025 15:56:31 +0200
Subject: [PATCH 1/2] [CIR] Implement functional cast to ComplexType

---
 clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp | 19 ++++++++++++++++++-
 clang/test/CIR/CodeGen/complex.cpp          | 18 ++++++++++++++++++
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp 
b/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
index c000b225f31f3..82b6a74a54b6c 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprComplex.cpp
@@ -43,6 +43,7 @@ class ComplexExprEmitter : public 
StmtVisitor<ComplexExprEmitter, mlir::Value> {
   mlir::Value VisitBinAssign(const BinaryOperator *e);
   mlir::Value VisitBinComma(const BinaryOperator *e);
   mlir::Value VisitCallExpr(const CallExpr *e);
+  mlir::Value VisitCastExpr(CastExpr *e);
   mlir::Value VisitChooseExpr(ChooseExpr *e);
   mlir::Value VisitDeclRefExpr(DeclRefExpr *e);
   mlir::Value VisitGenericSelectionExpr(GenericSelectionExpr *e);
@@ -83,12 +84,13 @@ LValue ComplexExprEmitter::emitBinAssignLValue(const 
BinaryOperator *e,
 mlir::Value ComplexExprEmitter::emitCast(CastKind ck, Expr *op,
                                          QualType destTy) {
   switch (ck) {
+  case CK_NoOp:
   case CK_LValueToRValue:
     return Visit(op);
   default:
-    cgf.cgm.errorNYI("ComplexType Cast");
     break;
   }
+  cgf.cgm.errorNYI("ComplexType Cast");
   return {};
 }
 
@@ -157,6 +159,21 @@ mlir::Value ComplexExprEmitter::VisitCallExpr(const 
CallExpr *e) {
   return cgf.emitCallExpr(e).getValue();
 }
 
+mlir::Value ComplexExprEmitter::VisitCastExpr(CastExpr *e) {
+  if (const auto *ece = dyn_cast<ExplicitCastExpr>(e)) {
+    // Bind VLAs in the cast type.
+    if (ece->getType()->isVariablyModifiedType()) {
+      cgf.cgm.errorNYI("VisitCastExpr Bind VLAs in the cast type");
+      return {};
+    }
+  }
+
+  if (e->changesVolatileQualification())
+    return emitLoadOfLValue(e);
+
+  return emitCast(e->getCastKind(), e->getSubExpr(), e->getType());
+}
+
 mlir::Value ComplexExprEmitter::VisitChooseExpr(ChooseExpr *e) {
   return Visit(e->getChosenSubExpr());
 }
diff --git a/clang/test/CIR/CodeGen/complex.cpp 
b/clang/test/CIR/CodeGen/complex.cpp
index 09e0ca03aa540..5d75f0e8a77c4 100644
--- a/clang/test/CIR/CodeGen/complex.cpp
+++ b/clang/test/CIR/CodeGen/complex.cpp
@@ -654,3 +654,21 @@ void foo26(int _Complex* a) {
 // OGCG: %[[B_IMAG_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr 
%[[COMPLEX_B]], i32 0, i32 1
 // OGCG: store i32 %[[A_REAL]], ptr %[[B_REAL_PTR]], align 4
 // OGCG: store i32 %[[A_IMAG]], ptr %[[B_IMAG_PTR]], align 4
+
+void foo29() {
+  using IntComplex = int _Complex;
+  int _Complex a = IntComplex{};
+}
+
+// CIR: %[[INIT:.*]] = cir.alloca !cir.complex<!s32i>, 
!cir.ptr<!cir.complex<!s32i>>, ["a", init]
+// CIR: %[[COMPLEX:.*]] = cir.const #cir.const_complex<#cir.int<0> : !s32i, 
#cir.int<0> : !s32i> : !cir.complex<!s32i>
+// CIR: cir.store align(4) %[[COMPLEX]], %[[INIT]] : !cir.complex<!s32i>, 
!cir.ptr<!cir.complex<!s32i>>
+
+// LLVM: %[[INIT:.*]] = alloca { i32, i32 }, i64 1, align 4
+// LLVM: store { i32, i32 } zeroinitializer, ptr %[[INIT]], align 4
+
+// OGCG: %[[INIT:.*]] = alloca { i32, i32 }, align 4
+// OGCG: %[[INIT_REAL_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr 
%[[INIT]], i32 0, i32 0
+// OGCG: %[[INIT_IMAG_PTR:.*]] = getelementptr inbounds nuw { i32, i32 }, ptr 
%[[INIT]], i32 0, i32 1
+// OGCG: store i32 0, ptr %[[INIT_REAL_PTR]], align 4
+// OGCG: store i32 0, ptr %[[INIT_IMAG_PTR]], align 4

>From 79fb67dca19c4a5b1b1fb1ecd4201bff7ae183f4 Mon Sep 17 00:00:00 2001
From: AmrDeveloper <am...@programmer.net>
Date: Sun, 6 Jul 2025 17:36:26 +0200
Subject: [PATCH 2/2] Replace align value with regex

---
 clang/test/CIR/CodeGen/complex.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/test/CIR/CodeGen/complex.cpp 
b/clang/test/CIR/CodeGen/complex.cpp
index 5d75f0e8a77c4..25b00788ff016 100644
--- a/clang/test/CIR/CodeGen/complex.cpp
+++ b/clang/test/CIR/CodeGen/complex.cpp
@@ -662,7 +662,7 @@ void foo29() {
 
 // CIR: %[[INIT:.*]] = cir.alloca !cir.complex<!s32i>, 
!cir.ptr<!cir.complex<!s32i>>, ["a", init]
 // CIR: %[[COMPLEX:.*]] = cir.const #cir.const_complex<#cir.int<0> : !s32i, 
#cir.int<0> : !s32i> : !cir.complex<!s32i>
-// CIR: cir.store align(4) %[[COMPLEX]], %[[INIT]] : !cir.complex<!s32i>, 
!cir.ptr<!cir.complex<!s32i>>
+// CIR: cir.store{{.*}} %[[COMPLEX]], %[[INIT]] : !cir.complex<!s32i>, 
!cir.ptr<!cir.complex<!s32i>>
 
 // LLVM: %[[INIT:.*]] = alloca { i32, i32 }, i64 1, align 4
 // LLVM: store { i32, i32 } zeroinitializer, ptr %[[INIT]], align 4

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